Supply-air device



FIG. 1 is a top perspective view of the supply-air device;

FIG. 2 is a side view of the supply-air device the opposite side being a mirror image of that shown;

FIG. 3 is a front view of the supply-air device;

FIG. 4 is a back view of the supply-air device;

FIG. 5 is a top view of the supply-air device; and,

FIG. 6 is a bottom view of the supply-air device. 

The ornamental design for a supply-air device, as shown and described. 